Monitor the resulting surface quality ring basically by two factors: the scene illumination of light source and sensor response characteristics of the spectrum. This is particularly true when using a color video camera, because color video camera compared with black and white video camera, need more light. Subject the light reflected by the scene is composed of a variety of different colors of light, it including relatively short wavelengths longer infrared and ultraviolet (are not visible). Most of the black and white video camera can see both visible and infrared light, and color video camera can only see visible light.

Scene lighting

Scene lighting will affect all black and white or color CCTV system performance.

No matter in indoor or outdoor, daytime or night, must consider and evaluate the light intensity of illumination and color are available, and and used it in comparison with the sensitivity of the camera. During the day, the camera must with automatic aperture of the lens, or have the function of electronic shutter, in order to avoid is affected by the strong light. At night, it is necessary to make the artificial lighting illumination and features match the spectra of the camera and lighting spirit, in order to guarantee the quality of video images.

Artificial lighting and natural lighting

Many people believe that lighting system belongs to fall under the jurisdiction of the architect or decorate a company. But we will

Must be clear, the type of lighting system and it can achieve illumination will be a decisive impact on all CCTV systems. Lighting light can be the sun, the moon or the stars, and other natural source can be from tungsten filament lamp, mercury lamp, fluorescent lamp, sodium lamp, metal arc lamp artificial light.

Illuminance decided to be photography as the luminous flux reaches the camera, thus directly affect the image quality by CCTV. When need to install lighting in working site, shall, first of all, to all sorts of lamps and lanterns - tungsten filament lamp, halogen tungsten lamp, metal arc lamp, sodium lamp, mercury lamp and so on - as a detailed comparison. To address available can't install lighting equipment, light intensity of illumination, spectral composition and evaluate the beam Angle, provide enough information subject scene, make use of the camera can be applied to the light environment, so as to produce good video picture.

Evaluation of light source and the scenes of subject

And when evaluating the light source, to analyze the following elements: commonly

(1) light source spectrum characteristic; (2) the light beam Angle; (3) the brightness of the light source; (4) the change of brightness; (5) the relative position of the camera and light source.

And when evaluating subject scene, we should consider:
(1) the reflectivity of subject in the scene; (2) the complexity of the scene; (3) in the scene moving target; (4) the whole scene contrast. Light source and the evaluation of the subject scene should be carried out at the same time, to make the camera to the best image quality.